18216103 has 4 divisors (see below), whose sum is σ = 18278568. Its totient is φ = 18153640.

The previous prime is 18216101. The next prime is 18216109. The reversal of 18216103 is 30161281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18216103 - 2¹ = 18216101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30793 + ... + 31378.

It is an arithmetic number, because the mean of its divisors is an integer number (4569642).

Almost surely, 2^18216103 is an apocalyptic number.

18216103 is a deficient number, since it is larger than the sum of its proper divisors (62465).

18216103 is an equidigital number, since it uses as much as digits as its factorization.

18216103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62464.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18216103 is about 4268.0326849733. The cubic root of 18216103 is about 263.1187664470.

Adding to 18216103 its reverse (30161281), we get a palindrome (48377384).

The spelling of 18216103 in words is "eighteen million, two hundred sixteen thousand, one hundred three".